Abstract
A GPS RF front-end receiving circuit is designed in accordance with the superheterodyne. The stage of the mixer is three and the signal of hybrid frequency is optimized through multiple filters to suppress the image signal. The ADS is used to establish the simulation platform for the RF front-end receiving circuit based on the L1 wave band. The pre-LNA is used to reduce system noise while the auto gain control element is used to achieve a large dynamic range of the RF receiver front-end. The parameters of the RF front-end including sensitivity, noise figure, IP3 and other indicators were simulated by the software simulation tools. The results indicate that this circuit could successfully implement the down-conversion and reception of radio frequency signal and meet the requirements of the design.
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